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382c157c11
- ABS - ACOS - ACOSH - ARABIC - ASIN - ASINH - ATAN - ATANH - ATAN2 - BASE - CEILING.MATH - CEILING.PRECISE - COMBIN - COMBINA - COS - COSH - DECIMAL - DEGREES - PI
48 lines
959 B
Go
48 lines
959 B
Go
// Copyright 2017 Baliance. All rights reserved.
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//
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// Use of this source code is governed by the terms of the Affero GNU General
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// Public License version 3.0 as published by the Free Software Foundation and
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// appearing in the file LICENSE included in the packaging of this file. A
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// commercial license can be purchased by contacting sales@baliance.com.
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package formula
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import (
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"io"
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"log"
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"strings"
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)
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//go:generate goyacc -l -o grammar.go grammar.y
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type plex struct {
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nodes chan *node
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result Expression
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}
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func (f *plex) Lex(lval *yySymType) int {
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//yyDebug = 3
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n := <-f.nodes
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if n != nil {
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lval.node = n
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return int(lval.node.token)
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}
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return 0
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}
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func (f *plex) Error(s string) {
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log.Printf("parse error: %s", s)
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}
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func Parse(r io.Reader) Expression {
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p := &plex{LexReader(r), nil}
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yyParse(p)
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return p.result
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}
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func ParseString(s string) Expression {
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if s == "" {
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return NewEmptyExpr()
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}
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return Parse(strings.NewReader(s))
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}
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